Caramelize onions slowly over low to medium heat, stirring frequently, for 30-45 minutes until they are deeply golden brown and sweet. Deglaze the pan with a splash of water or stock if they start to stick or burn.
Caramelizing onions is a process that transforms their sharp, pungent flavor into a sweet, mellow, and complex taste. This is achieved by slowly cooking the onions, allowing their natural sugars to break down and deepen in color. Here's a step-by-step guide:
Preparation: Start with about 2-3 large yellow or white onions. Slice them thinly and evenly. Uniform slices ensure even cooking.
The Right Pan: Use a heavy-bottomed pan, preferably stainless steel or cast iron. This helps distribute heat evenly and prevents hot spots that can lead to burning.
Heat and Fat: Add about 2-3 tablespoons of oil (vegetable, olive, or coconut oil work well) to the pan over low to medium heat. The heat should be gentle; patience is key. Add the sliced onions.
Stirring: Stir the onions frequently, especially in the beginning, to prevent them from sticking and burning. As they cook down, you can stir less often, but still keep an eye on them.
Deglazing (if needed): If the onions start to stick or brown too quickly, add a splash of water, stock, or even balsamic vinegar to the pan. This will loosen any browned bits from the bottom and add flavor. Scrape the bottom of the pan as you stir.
Seasoning: Season with a pinch of salt early on. Salt helps draw out moisture from the onions, which aids in the caramelization process. You can also add a pinch of sugar to enhance the sweetness, but it's not always necessary.
Patience: Continue cooking and stirring for 30-45 minutes, or until the onions are a deep golden brown color and very soft. The exact time will depend on the heat and the type of onions you're using.
The goal is to achieve a rich, sweet flavor without any bitterness from burning. The caramelized onions are now ready to be used as a base for your curry.
Don't overcrowd the pan. If you're making a large batch of caramelized onions, it's better to cook them in batches to ensure even cooking and prevent steaming. Overcrowding lowers the pan temperature and leads to steamed, rather than caramelized, onions.